Sound-regenerating device



Jams, 1929. 1,698,374

W. D. PACK SOUND REGENERATIN G DEVICE Filed May 1, 1926 film-awATTORNEYQ.

Patented Jan. 8, 1929.

UNITED STATES" PATENT OFFICE.

'WEHRLI D. PACK, OF SALT LAKE CITY, UTAH, ASSIGNOR TO-UTAH RADIOPRODUCTS COMPANY, INCORPORATED,

A CORPORATION OF UTAH.

Application filed May 1, 1926. Serial No. 106,130.

One of theobjects of the invention is to produce a sound regeneratingdevice which utilizes a folded membrane or diaphragm, folded so as togive stiifness in one direc 'tion and utilizing a sound vibrating memberattached to the fold of the membrane to impart vibrations thereto, suchvibrating unit being either an electric or similar type of device.

A further object of the invention is to produce a sound regeneratingdevice of the character herein described, which, due to its simplicityof construction, affords an exceptionally advantageous commercialarticle.

A further object of the invention is to regenerate the ori'gnal soundWaves or vibrations without the interposition of a re strictive or soundmodifying transformer such as a horn or megaphone, and therebyfaithfully reproduce the original sound vibrations without distortions.

A further object of the invention is the production of a soundregenerating device in the form of an open book which is simple,compact, inexpensive and attractive in appearance.

Other objects and advantages will appear as the nature of theimprovements is better understood, the invention consistingsubstantially in the novel arrangement and corelation ofinstrumentalities herein fully described, and illustrated in theaccompany-' ing drawings, wherein similar reference characters are usedto describe corresponding parts throughout the several views, and thenfinall pointed out and specifically dcfined and indicated in theappended claims.

gests a practical embodiment thereof, but

the invention is not to be restricted to the exact details of thisdisclosure, and the latter, therefore, is to be underestood from anillustrative, rather than restrictive, standpoint, g

The inventive idea involved is capable of receiving a variety ofmechanical expres- 'sions, one of which, for the purposes ofillustration, is shown in the accompanying drawings in which- Fig. 1 isa perspective view of a sound re generating device embodying myinvention;

Fig. 2 is a sectional view taken on the line 22 of Fig. 1 looking in thedirection of the arrow;

Fig. 3 is a sectional View taken on the line 33 of Fig. 1.

In the drawings 1 represents a membrane or diaphragm constructed of anydesirable material which will permit of the proper flexing of thediaphragm, such as compressed fibrous material, hot pressed 'paper,'fibre, cardboard, parchment; fibre-board, paper, sheet metal, aluminumor in fact any material may be used which is of a vibratory nature, andwhich can be properly held in a flexed position. The membrane ordiaphragm utilized is of a large area, and I I have discovered that ifvibrations occasioned by sound are imparted to the folded edge, whichfolded edge gives stiffness in one direction and hence the soundvibrations are transmitted from said folded edge outwardly in bothdirections," exceptionally clear, loud, distort-ionles's and accuratesound reproduction is obtained. In fact I have found that the soundvibrations so reproduced by such sound regenerating device are afaithful and natural reproduction .of the original sound vibrations. Themembrane or diaphragm is divided by'the folded edge. At the folded edgea sound reproducing device 6 is attached, such device being anelectromagnetic vibrating unit attached to the membrane at its foldededge by a connecting link 7.

I wish it distinctly understood that while I have shown anelectro-magnetically vibrating unit of the balanced armature type,

device is not so limited, and that any m vibrating unit, whetherelectrical or" mechanical may be utilized.

The members 5 are illustrated to imitate book ends, and enclosethe'sound vibrating unit, and also may be utilized as sounding boards toreinforce and amplify the sound vibrations.

In accordance with the provisions of the patent statute, Ijhavedescribed the principle of my invention, together with the device whichI now consider to represent a practi'-' cal embodiment thereof, but Idesire it understood that my invention is not confined to the particularform of device herein shown and described, the same being merelyillustrative, and that the invention can be carried out in other wayswithout departing from the spirit of my invention, and, therefore, Iclaim broadly the right to employ all equivalent instrumentalitiescoming within the scope of the appended claims, and by means of whichthe objects of my invention are attained, and the new resultsaccomplished. as herein set forth, as it is obvious that the particularembodiments herein shown and described are onlysome of many that can beemployed to attain these objects and accomplish these. results.

Having now described my invention,.what

I claim and desire to secure by Letters Patenti's:

- 1. In a device of the character described,

a unitary membrane secured at its edges and flexed into the form of acuspidal'arch and a sound vibratory member attached to said.

membrane at the'cusp.

2. In a device of the character described, a base, a unitarymembranesecured at its edges to said base and flexed into the form of acuspidal arch and a; sound vibrating member attached to said membrane.at the cusp, said membrane and said base forming fin enclosure for saidsound vibrating mem- In a device of the character described, arectangular base, said base having a pair of opposite substantiallyperpendicular walls the upper edges of said Walls having the contour ofa cuspidal curve, and a rec tangular membrane attached to said base atits ends with its edges'following the contour of the upper edges ofsaidwalls, and means for vibrating said membrane. v

4. In adevice of the character described, a rectangular base plate, saidbase plate having a pair of opposite, substantially perpendicular walls,the upper edges of said walls having the contour of a cuspidal curve, aflexed rectangular membrane attached to said base plate at its ends,with its edges following the contour of the upper edges of said Walls,and a sound vibrating membermounted upon said base plate and operativelyconnected to said membrane, said membrane, said walls and said baseforming a casing for said sound vibrating member.

5. In a device of the character described, a rectangular base latehaving a pair of opposite, substantial y perpendicular walls, the upperedges of said walls having the tached to said base at its ends andcreased through its center upon a line parallel to saidattached ends andflexed into the formation of a double arch of which said creased portionforms the cusp, and a sound vibrat- 'ing member mounted between saidbase and said membrane and having a connecting link perpendicular tosaid base and attached to the creased portion of said membrane.

7. As an article of manufacture, a sound amplifier of a form inimitation of an open book, comprising a rectangular base plate having anoutwardly curved central por-' tion simulating the back and cover boardsof an open book, a pair of substantially vertical walls having theirupper edges in the form of cuspidal curves simulating the top and bottomleaf edge surfaces of an open book, a rectangular membrane attached atits'ends to said base plate and with its side edges following the upperedges of said walls and curved to simulate the upper, opposite pages ofan open book, and a sound vibratin 1, member concealed under saidmembrane.

his specification signed this 23rd day of April, 1926.

VVEHRLI 1). PACK.

